SMTP Test Tool

Test your connection to Sendgrid, Mailgun, Amazon SES, or any SMTP server. See the exact SMTP "conversation" to help you troubleshoot email issues. FAQ.

Need a different SMTP service? Here's my technical review of popular SMTP services.

This tool is not working right now, because it's under an active DDOS attack. Please try back later.

SMTP Server

Sendgrid Mailgun SMTP2GO sendinblue JangoSMTP GMass

Port

25 2525 465 587

Security

Username

Password

From email address

To email address

Send your first campaign in a matter of minutes

No credit card required

Try GMass for free Then check out the quickstart guide to send your first mail merge email in minutes!